Sedimentation history and geodynamic evolution of the Mozambique Basin using seismic data
Mozambique, palaeobathymetry, seismic, backstripping, submarine fan, turbidite systems, Gondwana breakup, African uplift, bathymetry.
Gespeichert in:
| Autor*in: |
Castelino, Jude A. [verfasserIn] |
|---|---|
| Körperschaften: |
Universität Bremen [Grad-verleihende Institution] |
| Hochschulschrift: |
Dissertation ; Universität Bremen ; 2016 |
| Format: |
E-Book |
|---|---|
| Sprache: |
Englisch |
| Erschienen: |
Bremen: 2016 |
|---|
| Formangabe: |
Hochschulschrift |
|---|
| Umfang: |
1 Online-Ressource (XII, 115 Seiten) ; Illustrationen |
|---|
| Weitere Ausgabe: |
Erscheint auch als Druck-Ausgabe Castelino, Jude A.: Sedimentation history and geodynamic evolution of the Mozambique Basin using seismic data - Bremen, 2016 |
|---|
| Links: |
|---|
| DOI / URN: |
urn:nbn:de:gbv:46-00105638-17 |
|---|
| Katalog-ID: |
876179383 |
|---|
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| 520 | |a Continental break-up and collision and the opening and closing of ocean basin constitute the integral part of the Wilson cycle that constantly recycles the Earth's crust. The initial dispersal of the last supercontinent Gondwana into east and west Gondwana resulted in the formation of the several ocean basins along the margins. The oldest amongst the basins along the West Gondwana margin -- presently the Eastern Africa passive margin -- are the Somali and Mozambique basins. The submarine morphological features of passive margins are dominated by downslope and along slope processes that are directly or indirectly controlled by tectonic, oceanic and climatic settings. The Mozambique Basin hosts a thick and continuous sequence of sediment archive from the Jurassic separation of Antarctica from Africa but despite its economic and geological significance, the region continues to remain poorly studied. This cumulative dissertation focuses on the evolution of the Mozambique Basin and its transition from a rift basin to a passive margin basin. 2200 km of seismic profiles and bathymetry data acquired in 2007 have been used to study the controls on sediment architecture and dispersal of sediments in the basin along the Mozambican continental margin. Additionally, palaeobathymetry models of the Africa-Antarctic Corridor using "backstripping" technique and plate kinematics augment our knowledge of the basin. The palaeobathymetry models show topographic highs along the edge of the basin namely, the continental margins, Mozambique, Gunnerus, Astrid ridges enclosed the basin preventing any bottom circulation until the Late Cretaceous. High sediment accumulation rates coupled with a euxinic setting in a rapidly subsiding basin results the formation of shale layers interbedded with turbidite layers. The present-day 1800 km long and 400 km wide Mozambique Fan is spread out in the Mozambique Channel. Local sea-level change and increased sediment influx due to tectonic activity into the basin from the Zambezi in Late Cretaceous times resulted in the formation of an elongated submarine fan lobe into the Mozambique Channel north of Beira High. Strong north-south bottom currents commenced within the channel in Late Cretaceous times, forcing the aggradation of sediments on the southern flank of the lobe until the Eocene. In addition, we observe several current-controlled sediment deposits in the deeper basin that are influenced by north-south bottom currents. The taphrogenesis along the Mozambique margin ensured that turbidite systems continued to feed the basin after the mid-Oligocene marine regression with a large Channel-levee complex over Beira High supplying sediments from the southwest until Miocene times. Since the Miocene, sediments bypassed the shelf and upper fan region through the Zambezi Valley system directly into the Zambezi Channel. The palaeobathymetry models reveal a previously undocumented uplift in the Mozambique Basin ranging up to 1300 m, that cannot be explained by mantle convection or plumes alone as on the neighbouring African continent. Instead thickening of the oceanic crust due to underplating is a more reasonable assumption when the basin passed over the Quathlamba Hotspot during Early Paleogene that also produced Bassas Da India and Isle de Europa. Both conjugate margins display flexure over halfwavelengths of 60-80 km landwards and an amplitudes of 1500 m. Isolated crustal fragments of transitional or continental composition near the margin, including Beira High and Gunnerus Ridge subside in similar to adjoining oceanic crust. Overall, the new discoveries in this thesis make significant contributions to the understanding of passive margin development off Mozambique. | ||
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17,O02 dnb 1123194734 DE-101 urn:nbn:de:gbv:46-00105638-17 urn (DE-627)876179383 (DE-576)9876179381 (DE-599)GBV876179383 (OCoLC)967754419 DE-627 ger DE-627 rda eng XA-DE 550 DE-101 Castelino, Jude A. verfasserin aut Sedimentation history and geodynamic evolution of the Mozambique Basin using seismic data vorgelegt von Jude A. Castelino Bremen 2016 1 Online-Ressource (XII, 115 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2016 Mozambique, palaeobathymetry, seismic, backstripping, submarine fan, turbidite systems, Gondwana breakup, African uplift, bathymetry. Continental break-up and collision and the opening and closing of ocean basin constitute the integral part of the Wilson cycle that constantly recycles the Earth's crust. The initial dispersal of the last supercontinent Gondwana into east and west Gondwana resulted in the formation of the several ocean basins along the margins. The oldest amongst the basins along the West Gondwana margin -- presently the Eastern Africa passive margin -- are the Somali and Mozambique basins. The submarine morphological features of passive margins are dominated by downslope and along slope processes that are directly or indirectly controlled by tectonic, oceanic and climatic settings. The Mozambique Basin hosts a thick and continuous sequence of sediment archive from the Jurassic separation of Antarctica from Africa but despite its economic and geological significance, the region continues to remain poorly studied. This cumulative dissertation focuses on the evolution of the Mozambique Basin and its transition from a rift basin to a passive margin basin. 2200 km of seismic profiles and bathymetry data acquired in 2007 have been used to study the controls on sediment architecture and dispersal of sediments in the basin along the Mozambican continental margin. Additionally, palaeobathymetry models of the Africa-Antarctic Corridor using "backstripping" technique and plate kinematics augment our knowledge of the basin. The palaeobathymetry models show topographic highs along the edge of the basin namely, the continental margins, Mozambique, Gunnerus, Astrid ridges enclosed the basin preventing any bottom circulation until the Late Cretaceous. High sediment accumulation rates coupled with a euxinic setting in a rapidly subsiding basin results the formation of shale layers interbedded with turbidite layers. The present-day 1800 km long and 400 km wide Mozambique Fan is spread out in the Mozambique Channel. Local sea-level change and increased sediment influx due to tectonic activity into the basin from the Zambezi in Late Cretaceous times resulted in the formation of an elongated submarine fan lobe into the Mozambique Channel north of Beira High. Strong north-south bottom currents commenced within the channel in Late Cretaceous times, forcing the aggradation of sediments on the southern flank of the lobe until the Eocene. In addition, we observe several current-controlled sediment deposits in the deeper basin that are influenced by north-south bottom currents. The taphrogenesis along the Mozambique margin ensured that turbidite systems continued to feed the basin after the mid-Oligocene marine regression with a large Channel-levee complex over Beira High supplying sediments from the southwest until Miocene times. Since the Miocene, sediments bypassed the shelf and upper fan region through the Zambezi Valley system directly into the Zambezi Channel. The palaeobathymetry models reveal a previously undocumented uplift in the Mozambique Basin ranging up to 1300 m, that cannot be explained by mantle convection or plumes alone as on the neighbouring African continent. Instead thickening of the oceanic crust due to underplating is a more reasonable assumption when the basin passed over the Quathlamba Hotspot during Early Paleogene that also produced Bassas Da India and Isle de Europa. Both conjugate margins display flexure over halfwavelengths of 60-80 km landwards and an amplitudes of 1500 m. Isolated crustal fragments of transitional or continental composition near the margin, including Beira High and Gunnerus Ridge subside in similar to adjoining oceanic crust. Overall, the new discoveries in this thesis make significant contributions to the understanding of passive margin development off Mozambique. Langzeitarchivierung gewährleistet pdager Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Universität Bremen Grad-verleihende Institution (DE-588)2001386-3 (DE-627)101380429 (DE-576)191575038 dgg Bremen (DE-588)4008135-7 (DE-627)106369636 (DE-576)208874569 uvp Erscheint auch als Druck-Ausgabe Castelino, Jude A. 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17,O02 dnb 1123194734 DE-101 urn:nbn:de:gbv:46-00105638-17 urn (DE-627)876179383 (DE-576)9876179381 (DE-599)GBV876179383 (OCoLC)967754419 DE-627 ger DE-627 rda eng XA-DE 550 DE-101 Castelino, Jude A. verfasserin aut Sedimentation history and geodynamic evolution of the Mozambique Basin using seismic data vorgelegt von Jude A. Castelino Bremen 2016 1 Online-Ressource (XII, 115 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2016 Mozambique, palaeobathymetry, seismic, backstripping, submarine fan, turbidite systems, Gondwana breakup, African uplift, bathymetry. Continental break-up and collision and the opening and closing of ocean basin constitute the integral part of the Wilson cycle that constantly recycles the Earth's crust. The initial dispersal of the last supercontinent Gondwana into east and west Gondwana resulted in the formation of the several ocean basins along the margins. The oldest amongst the basins along the West Gondwana margin -- presently the Eastern Africa passive margin -- are the Somali and Mozambique basins. The submarine morphological features of passive margins are dominated by downslope and along slope processes that are directly or indirectly controlled by tectonic, oceanic and climatic settings. The Mozambique Basin hosts a thick and continuous sequence of sediment archive from the Jurassic separation of Antarctica from Africa but despite its economic and geological significance, the region continues to remain poorly studied. This cumulative dissertation focuses on the evolution of the Mozambique Basin and its transition from a rift basin to a passive margin basin. 2200 km of seismic profiles and bathymetry data acquired in 2007 have been used to study the controls on sediment architecture and dispersal of sediments in the basin along the Mozambican continental margin. Additionally, palaeobathymetry models of the Africa-Antarctic Corridor using "backstripping" technique and plate kinematics augment our knowledge of the basin. The palaeobathymetry models show topographic highs along the edge of the basin namely, the continental margins, Mozambique, Gunnerus, Astrid ridges enclosed the basin preventing any bottom circulation until the Late Cretaceous. High sediment accumulation rates coupled with a euxinic setting in a rapidly subsiding basin results the formation of shale layers interbedded with turbidite layers. The present-day 1800 km long and 400 km wide Mozambique Fan is spread out in the Mozambique Channel. Local sea-level change and increased sediment influx due to tectonic activity into the basin from the Zambezi in Late Cretaceous times resulted in the formation of an elongated submarine fan lobe into the Mozambique Channel north of Beira High. Strong north-south bottom currents commenced within the channel in Late Cretaceous times, forcing the aggradation of sediments on the southern flank of the lobe until the Eocene. In addition, we observe several current-controlled sediment deposits in the deeper basin that are influenced by north-south bottom currents. The taphrogenesis along the Mozambique margin ensured that turbidite systems continued to feed the basin after the mid-Oligocene marine regression with a large Channel-levee complex over Beira High supplying sediments from the southwest until Miocene times. Since the Miocene, sediments bypassed the shelf and upper fan region through the Zambezi Valley system directly into the Zambezi Channel. The palaeobathymetry models reveal a previously undocumented uplift in the Mozambique Basin ranging up to 1300 m, that cannot be explained by mantle convection or plumes alone as on the neighbouring African continent. Instead thickening of the oceanic crust due to underplating is a more reasonable assumption when the basin passed over the Quathlamba Hotspot during Early Paleogene that also produced Bassas Da India and Isle de Europa. Both conjugate margins display flexure over halfwavelengths of 60-80 km landwards and an amplitudes of 1500 m. Isolated crustal fragments of transitional or continental composition near the margin, including Beira High and Gunnerus Ridge subside in similar to adjoining oceanic crust. Overall, the new discoveries in this thesis make significant contributions to the understanding of passive margin development off Mozambique. Langzeitarchivierung gewährleistet pdager Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Universität Bremen Grad-verleihende Institution (DE-588)2001386-3 (DE-627)101380429 (DE-576)191575038 dgg Bremen (DE-588)4008135-7 (DE-627)106369636 (DE-576)208874569 uvp Erscheint auch als Druck-Ausgabe Castelino, Jude A. Sedimentation history and geodynamic evolution of the Mozambique Basin using seismic data Bremen, 2016 XII, 115 Seiten (DE-627)876179278 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 Resolving-System kostenfrei Volltext http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 2017-02-14 Resolving-System Volltext http://d-nb.info/1123194734/34 2017-02-14 Langzeitarchivierung Nationalbibliothek Volltext http://elib.suub.uni-bremen.de/edocs/00105638-1.pdf 2017-02-14 Verlag kostenfrei Volltext GBV-ODiss GBV_ILN_20 ISIL_DE-84 SYSFLAG_1 GBV_KXP GBV_ILN_21 ISIL_DE-46 GBV_ILN_22 ISIL_DE-18 GBV_ILN_23 ISIL_DE-830 GBV_ILN_30 ISIL_DE-104 GBV_ILN_40 ISIL_DE-7 GBV_ILN_60 ISIL_DE-705 GBV_ILN_63 ISIL_DE-Wim2 GBV_ILN_65 ISIL_DE-3 GBV_ILN_70 ISIL_DE-89 GBV_ILN_105 ISIL_DE-841 GBV_ILN_110 ISIL_DE-Luen4 GBV_ILN_132 ISIL_DE-959 GBV_ILN_151 ISIL_DE-546 GBV_ILN_161 ISIL_DE-960 GBV_ILN_293 ISIL_DE-960-3 GBV_ILN_370 ISIL_DE-1373 GBV_ILN_2403 ISIL_DE-LFER BO 20 01 0084 1664508686 x 16-02-17 21 01 0046 1657008584 ebook_2017_dissbremen Kostenloser Zugriff zza 06-01-17 22 01 0018 166455551X SUBolrd xu 16-02-17 23 01 0830 1664574042 olr-d x 16-02-17 30 01 0104 1664588671 z 16-02-17 40 01 0007 1664607455 xsn 16-02-17 60 01 0705 1664631313 OLRD z 16-02-17 63 01 3401 1664649247 ORD x 16-02-17 65 01 0003 4167910888 GBV-ODiss Open Access z 16-07-22 70 01 0089 166466226X zdo 16-02-17 105 01 0841 1664790020 z 16-02-17 110 01 3110 1664680136 x 16-02-17 132 01 0959 1664699821 OLR-DISS x 16-02-17 151 01 0546 3583648552 OLR-ODISS z 31-01-20 161 01 0960 1664719784 ORD x 16-02-17 293 01 3293 1664767576 ORD xf 16-02-17 370 01 4370 1664776931 x 16-02-17 2403 01 DE-LFER 3495936890 00 --%%-- --%%-- n --%%-- l01 23-07-19 20 01 0084 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 21 01 0046 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 LF 22 01 0018 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 23 01 0830 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 30 01 0104 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 40 01 0007 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 60 01 0705 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 63 01 3401 E-Book http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 LF 65 01 0003 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 70 01 0089 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 105 01 0841 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 110 01 3110 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 132 01 0959 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 151 01 0546 Volltext http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 161 01 0960 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 293 01 3293 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 370 01 4370 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 2403 01 DE-LFER http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 21 00 DE-46 00 Universität Bremen 21 00 DE-46 00 Fachbereich 05: Geowissenschaften (FB 05) 21 00 DE-46 99 07 60 01 0705 10 ho 20 01 0084 OLRD 110 01 3110 OLRD 370 01 4370 OLRD 21 01 0046 ebook_2017_dissbremen 22 01 0018 SUBolrd 23 01 0830 olr-d 60 01 0705 OLRD 63 01 3401 ORD 65 01 0003 GBV-ODiss 132 01 0959 OLR-DISS 151 01 0546 OLR-ODISS 161 01 0960 ORD 293 01 3293 ORD 23 01 0830 2017-02-16:09:41:12 |
| allfields_unstemmed |
17,O02 dnb 1123194734 DE-101 urn:nbn:de:gbv:46-00105638-17 urn (DE-627)876179383 (DE-576)9876179381 (DE-599)GBV876179383 (OCoLC)967754419 DE-627 ger DE-627 rda eng XA-DE 550 DE-101 Castelino, Jude A. verfasserin aut Sedimentation history and geodynamic evolution of the Mozambique Basin using seismic data vorgelegt von Jude A. Castelino Bremen 2016 1 Online-Ressource (XII, 115 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2016 Mozambique, palaeobathymetry, seismic, backstripping, submarine fan, turbidite systems, Gondwana breakup, African uplift, bathymetry. Continental break-up and collision and the opening and closing of ocean basin constitute the integral part of the Wilson cycle that constantly recycles the Earth's crust. The initial dispersal of the last supercontinent Gondwana into east and west Gondwana resulted in the formation of the several ocean basins along the margins. The oldest amongst the basins along the West Gondwana margin -- presently the Eastern Africa passive margin -- are the Somali and Mozambique basins. The submarine morphological features of passive margins are dominated by downslope and along slope processes that are directly or indirectly controlled by tectonic, oceanic and climatic settings. The Mozambique Basin hosts a thick and continuous sequence of sediment archive from the Jurassic separation of Antarctica from Africa but despite its economic and geological significance, the region continues to remain poorly studied. This cumulative dissertation focuses on the evolution of the Mozambique Basin and its transition from a rift basin to a passive margin basin. 2200 km of seismic profiles and bathymetry data acquired in 2007 have been used to study the controls on sediment architecture and dispersal of sediments in the basin along the Mozambican continental margin. Additionally, palaeobathymetry models of the Africa-Antarctic Corridor using "backstripping" technique and plate kinematics augment our knowledge of the basin. The palaeobathymetry models show topographic highs along the edge of the basin namely, the continental margins, Mozambique, Gunnerus, Astrid ridges enclosed the basin preventing any bottom circulation until the Late Cretaceous. High sediment accumulation rates coupled with a euxinic setting in a rapidly subsiding basin results the formation of shale layers interbedded with turbidite layers. The present-day 1800 km long and 400 km wide Mozambique Fan is spread out in the Mozambique Channel. Local sea-level change and increased sediment influx due to tectonic activity into the basin from the Zambezi in Late Cretaceous times resulted in the formation of an elongated submarine fan lobe into the Mozambique Channel north of Beira High. Strong north-south bottom currents commenced within the channel in Late Cretaceous times, forcing the aggradation of sediments on the southern flank of the lobe until the Eocene. In addition, we observe several current-controlled sediment deposits in the deeper basin that are influenced by north-south bottom currents. The taphrogenesis along the Mozambique margin ensured that turbidite systems continued to feed the basin after the mid-Oligocene marine regression with a large Channel-levee complex over Beira High supplying sediments from the southwest until Miocene times. Since the Miocene, sediments bypassed the shelf and upper fan region through the Zambezi Valley system directly into the Zambezi Channel. The palaeobathymetry models reveal a previously undocumented uplift in the Mozambique Basin ranging up to 1300 m, that cannot be explained by mantle convection or plumes alone as on the neighbouring African continent. Instead thickening of the oceanic crust due to underplating is a more reasonable assumption when the basin passed over the Quathlamba Hotspot during Early Paleogene that also produced Bassas Da India and Isle de Europa. Both conjugate margins display flexure over halfwavelengths of 60-80 km landwards and an amplitudes of 1500 m. Isolated crustal fragments of transitional or continental composition near the margin, including Beira High and Gunnerus Ridge subside in similar to adjoining oceanic crust. Overall, the new discoveries in this thesis make significant contributions to the understanding of passive margin development off Mozambique. Langzeitarchivierung gewährleistet pdager Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Universität Bremen Grad-verleihende Institution (DE-588)2001386-3 (DE-627)101380429 (DE-576)191575038 dgg Bremen (DE-588)4008135-7 (DE-627)106369636 (DE-576)208874569 uvp Erscheint auch als Druck-Ausgabe Castelino, Jude A. Sedimentation history and geodynamic evolution of the Mozambique Basin using seismic data Bremen, 2016 XII, 115 Seiten (DE-627)876179278 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 Resolving-System kostenfrei Volltext http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 2017-02-14 Resolving-System Volltext http://d-nb.info/1123194734/34 2017-02-14 Langzeitarchivierung Nationalbibliothek Volltext http://elib.suub.uni-bremen.de/edocs/00105638-1.pdf 2017-02-14 Verlag kostenfrei Volltext GBV-ODiss GBV_ILN_20 ISIL_DE-84 SYSFLAG_1 GBV_KXP GBV_ILN_21 ISIL_DE-46 GBV_ILN_22 ISIL_DE-18 GBV_ILN_23 ISIL_DE-830 GBV_ILN_30 ISIL_DE-104 GBV_ILN_40 ISIL_DE-7 GBV_ILN_60 ISIL_DE-705 GBV_ILN_63 ISIL_DE-Wim2 GBV_ILN_65 ISIL_DE-3 GBV_ILN_70 ISIL_DE-89 GBV_ILN_105 ISIL_DE-841 GBV_ILN_110 ISIL_DE-Luen4 GBV_ILN_132 ISIL_DE-959 GBV_ILN_151 ISIL_DE-546 GBV_ILN_161 ISIL_DE-960 GBV_ILN_293 ISIL_DE-960-3 GBV_ILN_370 ISIL_DE-1373 GBV_ILN_2403 ISIL_DE-LFER BO 20 01 0084 1664508686 x 16-02-17 21 01 0046 1657008584 ebook_2017_dissbremen Kostenloser Zugriff zza 06-01-17 22 01 0018 166455551X SUBolrd xu 16-02-17 23 01 0830 1664574042 olr-d x 16-02-17 30 01 0104 1664588671 z 16-02-17 40 01 0007 1664607455 xsn 16-02-17 60 01 0705 1664631313 OLRD z 16-02-17 63 01 3401 1664649247 ORD x 16-02-17 65 01 0003 4167910888 GBV-ODiss Open Access z 16-07-22 70 01 0089 166466226X zdo 16-02-17 105 01 0841 1664790020 z 16-02-17 110 01 3110 1664680136 x 16-02-17 132 01 0959 1664699821 OLR-DISS x 16-02-17 151 01 0546 3583648552 OLR-ODISS z 31-01-20 161 01 0960 1664719784 ORD x 16-02-17 293 01 3293 1664767576 ORD xf 16-02-17 370 01 4370 1664776931 x 16-02-17 2403 01 DE-LFER 3495936890 00 --%%-- --%%-- n --%%-- l01 23-07-19 20 01 0084 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 21 01 0046 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 LF 22 01 0018 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 23 01 0830 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 30 01 0104 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 40 01 0007 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 60 01 0705 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 63 01 3401 E-Book http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 LF 65 01 0003 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 70 01 0089 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 105 01 0841 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 110 01 3110 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 132 01 0959 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 151 01 0546 Volltext http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 161 01 0960 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 293 01 3293 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 370 01 4370 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 2403 01 DE-LFER http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 21 00 DE-46 00 Universität Bremen 21 00 DE-46 00 Fachbereich 05: Geowissenschaften (FB 05) 21 00 DE-46 99 07 60 01 0705 10 ho 20 01 0084 OLRD 110 01 3110 OLRD 370 01 4370 OLRD 21 01 0046 ebook_2017_dissbremen 22 01 0018 SUBolrd 23 01 0830 olr-d 60 01 0705 OLRD 63 01 3401 ORD 65 01 0003 GBV-ODiss 132 01 0959 OLR-DISS 151 01 0546 OLR-ODISS 161 01 0960 ORD 293 01 3293 ORD 23 01 0830 2017-02-16:09:41:12 |
| allfieldsGer |
17,O02 dnb 1123194734 DE-101 urn:nbn:de:gbv:46-00105638-17 urn (DE-627)876179383 (DE-576)9876179381 (DE-599)GBV876179383 (OCoLC)967754419 DE-627 ger DE-627 rda eng XA-DE 550 DE-101 Castelino, Jude A. verfasserin aut Sedimentation history and geodynamic evolution of the Mozambique Basin using seismic data vorgelegt von Jude A. Castelino Bremen 2016 1 Online-Ressource (XII, 115 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2016 Mozambique, palaeobathymetry, seismic, backstripping, submarine fan, turbidite systems, Gondwana breakup, African uplift, bathymetry. Continental break-up and collision and the opening and closing of ocean basin constitute the integral part of the Wilson cycle that constantly recycles the Earth's crust. The initial dispersal of the last supercontinent Gondwana into east and west Gondwana resulted in the formation of the several ocean basins along the margins. The oldest amongst the basins along the West Gondwana margin -- presently the Eastern Africa passive margin -- are the Somali and Mozambique basins. The submarine morphological features of passive margins are dominated by downslope and along slope processes that are directly or indirectly controlled by tectonic, oceanic and climatic settings. The Mozambique Basin hosts a thick and continuous sequence of sediment archive from the Jurassic separation of Antarctica from Africa but despite its economic and geological significance, the region continues to remain poorly studied. This cumulative dissertation focuses on the evolution of the Mozambique Basin and its transition from a rift basin to a passive margin basin. 2200 km of seismic profiles and bathymetry data acquired in 2007 have been used to study the controls on sediment architecture and dispersal of sediments in the basin along the Mozambican continental margin. Additionally, palaeobathymetry models of the Africa-Antarctic Corridor using "backstripping" technique and plate kinematics augment our knowledge of the basin. The palaeobathymetry models show topographic highs along the edge of the basin namely, the continental margins, Mozambique, Gunnerus, Astrid ridges enclosed the basin preventing any bottom circulation until the Late Cretaceous. High sediment accumulation rates coupled with a euxinic setting in a rapidly subsiding basin results the formation of shale layers interbedded with turbidite layers. The present-day 1800 km long and 400 km wide Mozambique Fan is spread out in the Mozambique Channel. Local sea-level change and increased sediment influx due to tectonic activity into the basin from the Zambezi in Late Cretaceous times resulted in the formation of an elongated submarine fan lobe into the Mozambique Channel north of Beira High. Strong north-south bottom currents commenced within the channel in Late Cretaceous times, forcing the aggradation of sediments on the southern flank of the lobe until the Eocene. In addition, we observe several current-controlled sediment deposits in the deeper basin that are influenced by north-south bottom currents. The taphrogenesis along the Mozambique margin ensured that turbidite systems continued to feed the basin after the mid-Oligocene marine regression with a large Channel-levee complex over Beira High supplying sediments from the southwest until Miocene times. Since the Miocene, sediments bypassed the shelf and upper fan region through the Zambezi Valley system directly into the Zambezi Channel. The palaeobathymetry models reveal a previously undocumented uplift in the Mozambique Basin ranging up to 1300 m, that cannot be explained by mantle convection or plumes alone as on the neighbouring African continent. Instead thickening of the oceanic crust due to underplating is a more reasonable assumption when the basin passed over the Quathlamba Hotspot during Early Paleogene that also produced Bassas Da India and Isle de Europa. Both conjugate margins display flexure over halfwavelengths of 60-80 km landwards and an amplitudes of 1500 m. Isolated crustal fragments of transitional or continental composition near the margin, including Beira High and Gunnerus Ridge subside in similar to adjoining oceanic crust. Overall, the new discoveries in this thesis make significant contributions to the understanding of passive margin development off Mozambique. Langzeitarchivierung gewährleistet pdager Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Universität Bremen Grad-verleihende Institution (DE-588)2001386-3 (DE-627)101380429 (DE-576)191575038 dgg Bremen (DE-588)4008135-7 (DE-627)106369636 (DE-576)208874569 uvp Erscheint auch als Druck-Ausgabe Castelino, Jude A. Sedimentation history and geodynamic evolution of the Mozambique Basin using seismic data Bremen, 2016 XII, 115 Seiten (DE-627)876179278 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 Resolving-System kostenfrei Volltext http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 2017-02-14 Resolving-System Volltext http://d-nb.info/1123194734/34 2017-02-14 Langzeitarchivierung Nationalbibliothek Volltext http://elib.suub.uni-bremen.de/edocs/00105638-1.pdf 2017-02-14 Verlag kostenfrei Volltext GBV-ODiss GBV_ILN_20 ISIL_DE-84 SYSFLAG_1 GBV_KXP GBV_ILN_21 ISIL_DE-46 GBV_ILN_22 ISIL_DE-18 GBV_ILN_23 ISIL_DE-830 GBV_ILN_30 ISIL_DE-104 GBV_ILN_40 ISIL_DE-7 GBV_ILN_60 ISIL_DE-705 GBV_ILN_63 ISIL_DE-Wim2 GBV_ILN_65 ISIL_DE-3 GBV_ILN_70 ISIL_DE-89 GBV_ILN_105 ISIL_DE-841 GBV_ILN_110 ISIL_DE-Luen4 GBV_ILN_132 ISIL_DE-959 GBV_ILN_151 ISIL_DE-546 GBV_ILN_161 ISIL_DE-960 GBV_ILN_293 ISIL_DE-960-3 GBV_ILN_370 ISIL_DE-1373 GBV_ILN_2403 ISIL_DE-LFER BO 20 01 0084 1664508686 x 16-02-17 21 01 0046 1657008584 ebook_2017_dissbremen Kostenloser Zugriff zza 06-01-17 22 01 0018 166455551X SUBolrd xu 16-02-17 23 01 0830 1664574042 olr-d x 16-02-17 30 01 0104 1664588671 z 16-02-17 40 01 0007 1664607455 xsn 16-02-17 60 01 0705 1664631313 OLRD z 16-02-17 63 01 3401 1664649247 ORD x 16-02-17 65 01 0003 4167910888 GBV-ODiss Open Access z 16-07-22 70 01 0089 166466226X zdo 16-02-17 105 01 0841 1664790020 z 16-02-17 110 01 3110 1664680136 x 16-02-17 132 01 0959 1664699821 OLR-DISS x 16-02-17 151 01 0546 3583648552 OLR-ODISS z 31-01-20 161 01 0960 1664719784 ORD x 16-02-17 293 01 3293 1664767576 ORD xf 16-02-17 370 01 4370 1664776931 x 16-02-17 2403 01 DE-LFER 3495936890 00 --%%-- --%%-- n --%%-- l01 23-07-19 20 01 0084 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 21 01 0046 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 LF 22 01 0018 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 23 01 0830 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 30 01 0104 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 40 01 0007 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 60 01 0705 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 63 01 3401 E-Book http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 LF 65 01 0003 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 70 01 0089 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 105 01 0841 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 110 01 3110 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 132 01 0959 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 151 01 0546 Volltext http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 161 01 0960 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 293 01 3293 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 370 01 4370 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 2403 01 DE-LFER http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 21 00 DE-46 00 Universität Bremen 21 00 DE-46 00 Fachbereich 05: Geowissenschaften (FB 05) 21 00 DE-46 99 07 60 01 0705 10 ho 20 01 0084 OLRD 110 01 3110 OLRD 370 01 4370 OLRD 21 01 0046 ebook_2017_dissbremen 22 01 0018 SUBolrd 23 01 0830 olr-d 60 01 0705 OLRD 63 01 3401 ORD 65 01 0003 GBV-ODiss 132 01 0959 OLR-DISS 151 01 0546 OLR-ODISS 161 01 0960 ORD 293 01 3293 ORD 23 01 0830 2017-02-16:09:41:12 |
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17,O02 dnb 1123194734 DE-101 urn:nbn:de:gbv:46-00105638-17 urn (DE-627)876179383 (DE-576)9876179381 (DE-599)GBV876179383 (OCoLC)967754419 DE-627 ger DE-627 rda eng XA-DE 550 DE-101 Castelino, Jude A. verfasserin aut Sedimentation history and geodynamic evolution of the Mozambique Basin using seismic data vorgelegt von Jude A. Castelino Bremen 2016 1 Online-Ressource (XII, 115 Seiten) Illustrationen Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Dissertation Universität Bremen 2016 Mozambique, palaeobathymetry, seismic, backstripping, submarine fan, turbidite systems, Gondwana breakup, African uplift, bathymetry. Continental break-up and collision and the opening and closing of ocean basin constitute the integral part of the Wilson cycle that constantly recycles the Earth's crust. The initial dispersal of the last supercontinent Gondwana into east and west Gondwana resulted in the formation of the several ocean basins along the margins. The oldest amongst the basins along the West Gondwana margin -- presently the Eastern Africa passive margin -- are the Somali and Mozambique basins. The submarine morphological features of passive margins are dominated by downslope and along slope processes that are directly or indirectly controlled by tectonic, oceanic and climatic settings. The Mozambique Basin hosts a thick and continuous sequence of sediment archive from the Jurassic separation of Antarctica from Africa but despite its economic and geological significance, the region continues to remain poorly studied. This cumulative dissertation focuses on the evolution of the Mozambique Basin and its transition from a rift basin to a passive margin basin. 2200 km of seismic profiles and bathymetry data acquired in 2007 have been used to study the controls on sediment architecture and dispersal of sediments in the basin along the Mozambican continental margin. Additionally, palaeobathymetry models of the Africa-Antarctic Corridor using "backstripping" technique and plate kinematics augment our knowledge of the basin. The palaeobathymetry models show topographic highs along the edge of the basin namely, the continental margins, Mozambique, Gunnerus, Astrid ridges enclosed the basin preventing any bottom circulation until the Late Cretaceous. High sediment accumulation rates coupled with a euxinic setting in a rapidly subsiding basin results the formation of shale layers interbedded with turbidite layers. The present-day 1800 km long and 400 km wide Mozambique Fan is spread out in the Mozambique Channel. Local sea-level change and increased sediment influx due to tectonic activity into the basin from the Zambezi in Late Cretaceous times resulted in the formation of an elongated submarine fan lobe into the Mozambique Channel north of Beira High. Strong north-south bottom currents commenced within the channel in Late Cretaceous times, forcing the aggradation of sediments on the southern flank of the lobe until the Eocene. In addition, we observe several current-controlled sediment deposits in the deeper basin that are influenced by north-south bottom currents. The taphrogenesis along the Mozambique margin ensured that turbidite systems continued to feed the basin after the mid-Oligocene marine regression with a large Channel-levee complex over Beira High supplying sediments from the southwest until Miocene times. Since the Miocene, sediments bypassed the shelf and upper fan region through the Zambezi Valley system directly into the Zambezi Channel. The palaeobathymetry models reveal a previously undocumented uplift in the Mozambique Basin ranging up to 1300 m, that cannot be explained by mantle convection or plumes alone as on the neighbouring African continent. Instead thickening of the oceanic crust due to underplating is a more reasonable assumption when the basin passed over the Quathlamba Hotspot during Early Paleogene that also produced Bassas Da India and Isle de Europa. Both conjugate margins display flexure over halfwavelengths of 60-80 km landwards and an amplitudes of 1500 m. Isolated crustal fragments of transitional or continental composition near the margin, including Beira High and Gunnerus Ridge subside in similar to adjoining oceanic crust. Overall, the new discoveries in this thesis make significant contributions to the understanding of passive margin development off Mozambique. Langzeitarchivierung gewährleistet pdager Hochschulschrift (DE-588)4113937-9 (DE-627)105825778 (DE-576)209480580 gnd-content Universität Bremen Grad-verleihende Institution (DE-588)2001386-3 (DE-627)101380429 (DE-576)191575038 dgg Bremen (DE-588)4008135-7 (DE-627)106369636 (DE-576)208874569 uvp Erscheint auch als Druck-Ausgabe Castelino, Jude A. Sedimentation history and geodynamic evolution of the Mozambique Basin using seismic data Bremen, 2016 XII, 115 Seiten (DE-627)876179278 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 Resolving-System kostenfrei Volltext http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 2017-02-14 Resolving-System Volltext http://d-nb.info/1123194734/34 2017-02-14 Langzeitarchivierung Nationalbibliothek Volltext http://elib.suub.uni-bremen.de/edocs/00105638-1.pdf 2017-02-14 Verlag kostenfrei Volltext GBV-ODiss GBV_ILN_20 ISIL_DE-84 SYSFLAG_1 GBV_KXP GBV_ILN_21 ISIL_DE-46 GBV_ILN_22 ISIL_DE-18 GBV_ILN_23 ISIL_DE-830 GBV_ILN_30 ISIL_DE-104 GBV_ILN_40 ISIL_DE-7 GBV_ILN_60 ISIL_DE-705 GBV_ILN_63 ISIL_DE-Wim2 GBV_ILN_65 ISIL_DE-3 GBV_ILN_70 ISIL_DE-89 GBV_ILN_105 ISIL_DE-841 GBV_ILN_110 ISIL_DE-Luen4 GBV_ILN_132 ISIL_DE-959 GBV_ILN_151 ISIL_DE-546 GBV_ILN_161 ISIL_DE-960 GBV_ILN_293 ISIL_DE-960-3 GBV_ILN_370 ISIL_DE-1373 GBV_ILN_2403 ISIL_DE-LFER BO 20 01 0084 1664508686 x 16-02-17 21 01 0046 1657008584 ebook_2017_dissbremen Kostenloser Zugriff zza 06-01-17 22 01 0018 166455551X SUBolrd xu 16-02-17 23 01 0830 1664574042 olr-d x 16-02-17 30 01 0104 1664588671 z 16-02-17 40 01 0007 1664607455 xsn 16-02-17 60 01 0705 1664631313 OLRD z 16-02-17 63 01 3401 1664649247 ORD x 16-02-17 65 01 0003 4167910888 GBV-ODiss Open Access z 16-07-22 70 01 0089 166466226X zdo 16-02-17 105 01 0841 1664790020 z 16-02-17 110 01 3110 1664680136 x 16-02-17 132 01 0959 1664699821 OLR-DISS x 16-02-17 151 01 0546 3583648552 OLR-ODISS z 31-01-20 161 01 0960 1664719784 ORD x 16-02-17 293 01 3293 1664767576 ORD xf 16-02-17 370 01 4370 1664776931 x 16-02-17 2403 01 DE-LFER 3495936890 00 --%%-- --%%-- n --%%-- l01 23-07-19 20 01 0084 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 21 01 0046 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 LF 22 01 0018 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 23 01 0830 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 30 01 0104 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 40 01 0007 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 60 01 0705 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 63 01 3401 E-Book http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 LF 65 01 0003 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 70 01 0089 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 105 01 0841 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 110 01 3110 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 132 01 0959 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 151 01 0546 Volltext http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 161 01 0960 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 293 01 3293 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 370 01 4370 http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 2403 01 DE-LFER http://nbn-resolving.de/urn:nbn:de:gbv:46-00105638-17 21 00 DE-46 00 Universität Bremen 21 00 DE-46 00 Fachbereich 05: Geowissenschaften (FB 05) 21 00 DE-46 99 07 60 01 0705 10 ho 20 01 0084 OLRD 110 01 3110 OLRD 370 01 4370 OLRD 21 01 0046 ebook_2017_dissbremen 22 01 0018 SUBolrd 23 01 0830 olr-d 60 01 0705 OLRD 63 01 3401 ORD 65 01 0003 GBV-ODiss 132 01 0959 OLR-DISS 151 01 0546 OLR-ODISS 161 01 0960 ORD 293 01 3293 ORD 23 01 0830 2017-02-16:09:41:12 |
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sedimentation history and geodynamic evolution of the mozambique basin using seismic data |
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Sedimentation history and geodynamic evolution of the Mozambique Basin using seismic data |
| abstract |
Mozambique, palaeobathymetry, seismic, backstripping, submarine fan, turbidite systems, Gondwana breakup, African uplift, bathymetry. Continental break-up and collision and the opening and closing of ocean basin constitute the integral part of the Wilson cycle that constantly recycles the Earth's crust. The initial dispersal of the last supercontinent Gondwana into east and west Gondwana resulted in the formation of the several ocean basins along the margins. The oldest amongst the basins along the West Gondwana margin -- presently the Eastern Africa passive margin -- are the Somali and Mozambique basins. The submarine morphological features of passive margins are dominated by downslope and along slope processes that are directly or indirectly controlled by tectonic, oceanic and climatic settings. The Mozambique Basin hosts a thick and continuous sequence of sediment archive from the Jurassic separation of Antarctica from Africa but despite its economic and geological significance, the region continues to remain poorly studied. This cumulative dissertation focuses on the evolution of the Mozambique Basin and its transition from a rift basin to a passive margin basin. 2200 km of seismic profiles and bathymetry data acquired in 2007 have been used to study the controls on sediment architecture and dispersal of sediments in the basin along the Mozambican continental margin. Additionally, palaeobathymetry models of the Africa-Antarctic Corridor using "backstripping" technique and plate kinematics augment our knowledge of the basin. The palaeobathymetry models show topographic highs along the edge of the basin namely, the continental margins, Mozambique, Gunnerus, Astrid ridges enclosed the basin preventing any bottom circulation until the Late Cretaceous. High sediment accumulation rates coupled with a euxinic setting in a rapidly subsiding basin results the formation of shale layers interbedded with turbidite layers. The present-day 1800 km long and 400 km wide Mozambique Fan is spread out in the Mozambique Channel. Local sea-level change and increased sediment influx due to tectonic activity into the basin from the Zambezi in Late Cretaceous times resulted in the formation of an elongated submarine fan lobe into the Mozambique Channel north of Beira High. Strong north-south bottom currents commenced within the channel in Late Cretaceous times, forcing the aggradation of sediments on the southern flank of the lobe until the Eocene. In addition, we observe several current-controlled sediment deposits in the deeper basin that are influenced by north-south bottom currents. The taphrogenesis along the Mozambique margin ensured that turbidite systems continued to feed the basin after the mid-Oligocene marine regression with a large Channel-levee complex over Beira High supplying sediments from the southwest until Miocene times. Since the Miocene, sediments bypassed the shelf and upper fan region through the Zambezi Valley system directly into the Zambezi Channel. The palaeobathymetry models reveal a previously undocumented uplift in the Mozambique Basin ranging up to 1300 m, that cannot be explained by mantle convection or plumes alone as on the neighbouring African continent. Instead thickening of the oceanic crust due to underplating is a more reasonable assumption when the basin passed over the Quathlamba Hotspot during Early Paleogene that also produced Bassas Da India and Isle de Europa. Both conjugate margins display flexure over halfwavelengths of 60-80 km landwards and an amplitudes of 1500 m. Isolated crustal fragments of transitional or continental composition near the margin, including Beira High and Gunnerus Ridge subside in similar to adjoining oceanic crust. Overall, the new discoveries in this thesis make significant contributions to the understanding of passive margin development off Mozambique. |
| abstractGer |
Mozambique, palaeobathymetry, seismic, backstripping, submarine fan, turbidite systems, Gondwana breakup, African uplift, bathymetry. Continental break-up and collision and the opening and closing of ocean basin constitute the integral part of the Wilson cycle that constantly recycles the Earth's crust. The initial dispersal of the last supercontinent Gondwana into east and west Gondwana resulted in the formation of the several ocean basins along the margins. The oldest amongst the basins along the West Gondwana margin -- presently the Eastern Africa passive margin -- are the Somali and Mozambique basins. The submarine morphological features of passive margins are dominated by downslope and along slope processes that are directly or indirectly controlled by tectonic, oceanic and climatic settings. The Mozambique Basin hosts a thick and continuous sequence of sediment archive from the Jurassic separation of Antarctica from Africa but despite its economic and geological significance, the region continues to remain poorly studied. This cumulative dissertation focuses on the evolution of the Mozambique Basin and its transition from a rift basin to a passive margin basin. 2200 km of seismic profiles and bathymetry data acquired in 2007 have been used to study the controls on sediment architecture and dispersal of sediments in the basin along the Mozambican continental margin. Additionally, palaeobathymetry models of the Africa-Antarctic Corridor using "backstripping" technique and plate kinematics augment our knowledge of the basin. The palaeobathymetry models show topographic highs along the edge of the basin namely, the continental margins, Mozambique, Gunnerus, Astrid ridges enclosed the basin preventing any bottom circulation until the Late Cretaceous. High sediment accumulation rates coupled with a euxinic setting in a rapidly subsiding basin results the formation of shale layers interbedded with turbidite layers. The present-day 1800 km long and 400 km wide Mozambique Fan is spread out in the Mozambique Channel. Local sea-level change and increased sediment influx due to tectonic activity into the basin from the Zambezi in Late Cretaceous times resulted in the formation of an elongated submarine fan lobe into the Mozambique Channel north of Beira High. Strong north-south bottom currents commenced within the channel in Late Cretaceous times, forcing the aggradation of sediments on the southern flank of the lobe until the Eocene. In addition, we observe several current-controlled sediment deposits in the deeper basin that are influenced by north-south bottom currents. The taphrogenesis along the Mozambique margin ensured that turbidite systems continued to feed the basin after the mid-Oligocene marine regression with a large Channel-levee complex over Beira High supplying sediments from the southwest until Miocene times. Since the Miocene, sediments bypassed the shelf and upper fan region through the Zambezi Valley system directly into the Zambezi Channel. The palaeobathymetry models reveal a previously undocumented uplift in the Mozambique Basin ranging up to 1300 m, that cannot be explained by mantle convection or plumes alone as on the neighbouring African continent. Instead thickening of the oceanic crust due to underplating is a more reasonable assumption when the basin passed over the Quathlamba Hotspot during Early Paleogene that also produced Bassas Da India and Isle de Europa. Both conjugate margins display flexure over halfwavelengths of 60-80 km landwards and an amplitudes of 1500 m. Isolated crustal fragments of transitional or continental composition near the margin, including Beira High and Gunnerus Ridge subside in similar to adjoining oceanic crust. Overall, the new discoveries in this thesis make significant contributions to the understanding of passive margin development off Mozambique. |
| abstract_unstemmed |
Mozambique, palaeobathymetry, seismic, backstripping, submarine fan, turbidite systems, Gondwana breakup, African uplift, bathymetry. Continental break-up and collision and the opening and closing of ocean basin constitute the integral part of the Wilson cycle that constantly recycles the Earth's crust. The initial dispersal of the last supercontinent Gondwana into east and west Gondwana resulted in the formation of the several ocean basins along the margins. The oldest amongst the basins along the West Gondwana margin -- presently the Eastern Africa passive margin -- are the Somali and Mozambique basins. The submarine morphological features of passive margins are dominated by downslope and along slope processes that are directly or indirectly controlled by tectonic, oceanic and climatic settings. The Mozambique Basin hosts a thick and continuous sequence of sediment archive from the Jurassic separation of Antarctica from Africa but despite its economic and geological significance, the region continues to remain poorly studied. This cumulative dissertation focuses on the evolution of the Mozambique Basin and its transition from a rift basin to a passive margin basin. 2200 km of seismic profiles and bathymetry data acquired in 2007 have been used to study the controls on sediment architecture and dispersal of sediments in the basin along the Mozambican continental margin. Additionally, palaeobathymetry models of the Africa-Antarctic Corridor using "backstripping" technique and plate kinematics augment our knowledge of the basin. The palaeobathymetry models show topographic highs along the edge of the basin namely, the continental margins, Mozambique, Gunnerus, Astrid ridges enclosed the basin preventing any bottom circulation until the Late Cretaceous. High sediment accumulation rates coupled with a euxinic setting in a rapidly subsiding basin results the formation of shale layers interbedded with turbidite layers. The present-day 1800 km long and 400 km wide Mozambique Fan is spread out in the Mozambique Channel. Local sea-level change and increased sediment influx due to tectonic activity into the basin from the Zambezi in Late Cretaceous times resulted in the formation of an elongated submarine fan lobe into the Mozambique Channel north of Beira High. Strong north-south bottom currents commenced within the channel in Late Cretaceous times, forcing the aggradation of sediments on the southern flank of the lobe until the Eocene. In addition, we observe several current-controlled sediment deposits in the deeper basin that are influenced by north-south bottom currents. The taphrogenesis along the Mozambique margin ensured that turbidite systems continued to feed the basin after the mid-Oligocene marine regression with a large Channel-levee complex over Beira High supplying sediments from the southwest until Miocene times. Since the Miocene, sediments bypassed the shelf and upper fan region through the Zambezi Valley system directly into the Zambezi Channel. The palaeobathymetry models reveal a previously undocumented uplift in the Mozambique Basin ranging up to 1300 m, that cannot be explained by mantle convection or plumes alone as on the neighbouring African continent. Instead thickening of the oceanic crust due to underplating is a more reasonable assumption when the basin passed over the Quathlamba Hotspot during Early Paleogene that also produced Bassas Da India and Isle de Europa. Both conjugate margins display flexure over halfwavelengths of 60-80 km landwards and an amplitudes of 1500 m. Isolated crustal fragments of transitional or continental composition near the margin, including Beira High and Gunnerus Ridge subside in similar to adjoining oceanic crust. Overall, the new discoveries in this thesis make significant contributions to the understanding of passive margin development off Mozambique. |
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| score |
7.40176 |